668668707 has 24 divisors (see below), whose sum is σ = 1104669696. Its totient is φ = 381807216.

The previous prime is 668668697. The next prime is 668668711. The reversal of 668668707 is 707866866.

It is not a de Polignac number, because 668668707 - 2¹⁴ = 668652323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668668717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101838 + ... + 108204.

It is an arithmetic number, because the mean of its divisors is an integer number (46027904).

Almost surely, 2^668668707 is an apocalyptic number.

668668707 is a deficient number, since it is larger than the sum of its proper divisors (436000989).

668668707 is a wasteful number, since it uses less digits than its factorization.

668668707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8047 (or 8044 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The square root of 668668707 is about 25858.6292560143. The cubic root of 668668707 is about 874.4540624924.

The spelling of 668668707 in words is "six hundred sixty-eight million, six hundred sixty-eight thousand, seven hundred seven".